MANUAL ROOF FANS008

18
| Troubleshooting/maintenance/repair
Troubleshooting cont'd
Air output of fan too
low
Impeller rotates in wrong
direction.
Change direction of rotation (swap two phases in case of
a 3– phase motor).
Wrong wiring configuration (e.g.
Y instead of Delta).
Check and possibly correct the wiring configuration.
Pressure losses too high. Optimize the line routing.
Flow regulators not or only
partly open.
Check opening position on site.
Intake or pressure ducts are
blocked.
Remove the blockage.
If the heat build-up in EC motors
is too high, the power is
throttled to protect the
electronics or to prevent a
shutdown. As soon as the
temperature comes back to a
normal value, the motor returns
to adjusted speed.
(Valid for fans driven by EC
Motors with “derating function”
only)
Check ambient temperature.
Improve cooling.
Grinding sounds
when starting or
operating the fan
Check if the duct connections of
the fan are strained.
Loosen the duct connections and realign it.
Thermal contacts/
resistors have
triggered
Impeller rotates in wrong
direction.
Change direction of rotation if possible, otherwise contact
Systemair.
Missing phase
In case of a 3 phase standard motor (not EC), check if all 3
phase are present.
Motor overheated
Check the cooling impeller (if used), measure the motor
winding (if possible) / contact Systemair.
Capacitor (if used) not or not
correctly connected.
Connect the capacitor correctly.
Motor blocked
Contact Systemair
Motor does not
rotate
Faulty supply voltage Check the supply voltage, re-establish the voltage supply.
Faulty connection
Disconnect from the power supply, correct the
connection, see circuit diagram.
Temperature monitor has
responded.
Allow the motor to cool down, find and resolve the cause
of the fault.
Electronics/motor
overheated
Insufficient cooling Improve cooling.
Overloaded motor
Check if the correct fan is used for your application.
Ambient temperature too high Check if the correct fan is used for your application.
Note:
For all other damage/defects, please contact Systemair. Defective safety-relevant fans (for Ex and smoke
extraction applications) must be replaced completely.
| 008